Method for preserving hydrosulfite liquors from decomposition



P. MACINTYRE.

METHOD FOR FRESERVING HYDROSULFITE LIOUORS FROM DECOMPOSITIDN.

a APPITICATION FILED AUGJB 1919. 3533,

290 Patented Mar. 9, 1920.

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-ods for Preserving is a specification.

UNITED STATES Pn'lntiv'r OFFICE.

l PETER MACINTYRE, OF CLINTON, MASSACHUSETTS.

Specification of Letters Patent.

Patented Mar. 9, 1920.

Application filed August 13, lait). Serial No. 317,307.

To all whom t may concern.'

Be it known that I, PETER MGINTYRE, a citizen of the United States, residingA at Clinton, in the county of Worcester and State of Massachusetts, have invented certain new and useful Im rovements in Methydrosulfite Liquors from Decomposition, of which the following My invention relates to a method for preservmg hydrosulte liquor from decomposition.

Hydrosulte liquor, as now used in the indigo dyeing industry rapidly decomposes, oxidizing and losing its strength over night, so that it is now the usual practiceto make new liquor each day in order to obtain at factory results.

I have dlscovered that hydrosullite liqiior,

if kept at a sufficiently low temperature and out of contactfwith any oxidizing agency, such as air, may be kept for several weeks without losingits strength, thus resulting in economy in the making of the liquor and saving of waste in stocks, time and labor, whenever vat colors are used.

An apparatus for carrying out the method is illustrated in the accompanying drawings in which Figure l is a sectional elevation; and

Fig. 2 is a plan view.

Referring to the drawings A is a tank provided with an inlet pipe B and an out et pipe C. Within the tank A, throu h which ice-water is passed, are iron tan D and E for containing hydrosullite liquor, thesetanks being spaced above the bottom of the tank A to permit free circulation of j water entirely around the interior tanks.

hydrosulte F is a pipe for supplyin G, (1g, are delivery liquor to the tanks, and

The tanks arel provided with vfloat-sipes 1, I-I, connectedto indicators I, on the outside of the tanks, for showing' the `level of the liquor within the tanks. In operation, ice-cold water is supplied through pipe B. and circulates around the tanks, flowing out through pipe C at the bottom. The hydrosulite liquor is introduced through pipe F, and when the tanks are filled to the desired depth, suicient oil to cover the liquor for the depth of about an inch, is poured in on top of the liquor, thus excluding the air and forming an air-tight seal. The indicators enable the operator to ascertain when the tanks are nearly empty, so that drawing of 'the oil may be-avoided. Suflicient 011 is tion of h drosulte liquor which consists in maintaining the liquor at a temperature low enough to prevent decomposition and at the same time excluding oxidizing influences.

2. .The method of preventingdecomposition of hydrosulte liquorwhich consists in maintainmg the liquor at a temperature low enough to revent decomposition and at the same time eep it covered with an air-tight seal of oil. Y f

3. The method of preventing decomposi-y tion of hydrosulte liquor which consists in maintainmg it at about the temperature of ice-water while covered with an air-tigh seal of oil.

In testimony whereof, I ax my signature.

PETER MAGINTYRE. 

